Your trick or treating days may be behind you, but for adults, the Halloween festivities are just getting started.

For the week leading up to Oct. 31, Brooklyn will be shaking in fright and delight with blow-out costume parties, haunted houses, and horror movie marathons.

High-tech heebeegeebees

The Gravesend Inn returns for another year of animatronic-fueled fear. The haunted hotel, masterminded by New York City College of Technology’s entertainment technology department, has been spooking kids and adults alike since 1999 with its theme-park quality scares. It’s no fun to spoil the surprises, but the electrified attraction features sensors that enable the thrills to follow people as they move throughout, so there’s a guaranteed surprise at every turn.

Spirited stroll

Green-Wood Cemetery has the spooky holiday in mind when it hosts its popular walking tours on Oct. 26 and 27. You’ll have the chance to go inside the Catacombs, which are usually closed to the public, and visit the final resting places of some questionable characters. The lineup includes tobacconist John Anderson, a suspect in the 1842 murder of the “beautiful cigar girl,” Mary Rogers; and Bill “the Butcher” Poole, the inspiration for Daniel Day-Lewis’ character in “Gangs of New York.” Historian Jeff Richman will lead you through these dark, true tales.

Coney Boardwalk Empire

“Boardwalk Empire” meets the Coney Island Boardwalk in “Coney Island Criminals,” a one-act play written by Dick Zigun that tells the true tale of how Al “Scarface” Capone acquired his infamous facial scars. There’s sex, violence, seedy speakeasies, and flying blood — some of which even gets on the audience. So if you plan on sitting near the front, dress to get messy.

Mister Halloween Night

What’s scarier than zombies, werewolves, or a government shutdown? For the folks behind roving dance party Mister Saturday Night, the clear answer is global warming. On Oct. 26, they will transform a Clinton Hill loft into an underwater city with Water World, their answer to the scariest holiday of the year. Expect starfish on the walls, bioluminescent creatures to light the disco ball, and guests dressed to impress, as costumes are required. Think the Little Mermaid, as well as melting ice caps, Jacques Cousteau, Noah’s Ark, and scuba divers for some aquatic inspiration.

Water World at 12-turn-13 (172 Classon Ave. between Myrtle and Park Avenues in Clinton Hill, www.mistersaturdaynight.com), Oct. 26 at 10 pm, $25.

Drink to that

TinyRhino is a 10-minute play festival combined with a theatrical drinking game from event company UglyRhino. Here’s how it works: six playwrights write new plays, each containing the same five dramatic elements. When these elements show up during the show, audience members take a drink. For the Oct. 29 edition at Littlefield, there’s special horror movie theme for Halloween. Bottoms up.

Scary movie marathon

Nitehawk Cinema will live up to its name this Halloween with an overnight horror film fest. From 10 pm to 8 am, it will screen five classic horror films: “American Werewolf in London,” “Burn Witch Burn,” “Fright Night,” “The Burning,” and “Dawn of the Dead.” There will also be a costume contest and trivia, plus free popcorn, coffee, and breakfast in the morning.

’90s redux

Break out your Doc Martens, flannel, and fishnets. Union Hall is celebrating Halloween with “My So-Called Prom,” a 1990s-themed party with a flavor for the alternative. Aptly-named party band the Bayside Tigers will be playing an all-grunge and alt-rock set. So for costume purposes, just dress like you’re an extra in the “Smells Like Teen Spirit” video.

“My So-Called Prom” at the Bell House (149 Seventh St. between Second and Third avenues in Gowanus, www.thebellhouseny.com), Oct. 31, 9 pm, $15 or $12 advance.

Hair band

If you had ever thought about forming a Dionne Warwick tribute band that dresses up like werewolves — sorry, it’s taken. The inspired Dionne Werewolf specializes in Warwick, Burt Bacharach, and Hal David’s greatest hits from the 1960s and ’70s. Sounds like a howling good time.

Reasonable discourse

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